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Optimization of signal behavior in the transition to driven equilibrium in steady‐state free precession sequences
Author(s) -
Hennig Juergen,
Speck Oliver,
Scheffler Klaus
Publication year - 2002
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.10274
Subject(s) - steady state free precession imaging , initialization , precession , spins , flip angle , signal (programming language) , steady state (chemistry) , physics , nuclear magnetic resonance , phase (matter) , signal to noise ratio (imaging) , noise (video) , computational physics , statistical physics , computer science , optics , magnetic resonance imaging , chemistry , condensed matter physics , image (mathematics) , artificial intelligence , quantum mechanics , medicine , radiology , programming language
A new technique to avoid the initial signal fluctuations in steady‐state free precession (SSFP)‐sequences, such as trueFISP, FIESTA, and refocused FFE, is presented. The “transition into driven equilibrium” (TIDE) sequence uses modified flip angles over the initialization phase of a SSFP experiment, which not only avoids image artifacts but also improves the signal‐to‐noise ratio (SNR) and contrast behavior compared to conventional approaches. TIDE is demonstrated to be robust against variations of T 1 and T 2 , and leads to a monotonous signal evolution for off‐resonance spins. The basic principles can also be applied repetitively to optimize continuous 3D acquisitions. Magn Reson Med 48:801–809, 2002. © 2002 Wiley‐Liss, Inc.